High-speed photas of a 33o Jamping verthiatly ind icate that he jump lasts -ams

Question

High-speed photas of a 33o Jamping verthiatly ind icate that he jump lasts -ams and invdues an average vertical acceleration of looq: whst buerag e (a) fora and Cb) inpulss does the ground exort onthatiea during its jump? c) what's the faa's change in momentum during ts jump Pysicians use the needle blopsy techaiqua to take hss samples Grom internal organs spring tissue i extracting the needle brings out the tssucore. A 3chcalar device uses 3.3 mg nedlesthat take 90ms tostop in the tissua, which exerts a stop, n g force ° f 4.4 N. ( a) Find the impulse imparted by the spriny (b) Houw žar into the tissue does the naed la panetrake? oadad qun shoots a hollow nedla intoths

Explanation / Answer

(36) (a) Fnet = F - m g = ma  

F = ma + m g = 101 mg

F = 101 x 220 x 10^-9 x 9.8

F = 2.18 x 10^-4 N ........Ans

(B) impulse = F t

= (2.18 x 10^-4) (1.2 x 10^-3)

= 2.61 x 10^-7 kg m/s Or Ns

(c) change in momentum = impulse

change in momentum = 2.61 x 10^-7 kg m/s

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